A surprised (and muffled) grunt from him at the sudden flip. Then a startled yelp. He stares at her over his shoulder, wide-eyed. This sort of play is clearly new to him; whatever he's done with Hythlodaeus never included this.

It's confusing. It's arousing - because she's holding his cock? He isn't sure. But it isn't unpleasant so he doesn't try to put a stop to it.

He nearly speaks again but presses his lips together at the last moment. This must be why safe words are used, he realises. For situations like this that get out of hand. Opting to trust Irhya not to go too far, he puts his head down meekly (as meekly as someone like him can anyway) and waits.